[PR #10972/a023a245 backport][3.12] Upgrade to llhttp 3.9

[patchback]

This is a backport of PR #10972 as merged into master (a023a24).

None

[codspeed-hq]

CodSpeed Performance Report

Merging #10973 will not alter performance

_{Comparing patchback/backports/3.12/a023a245f675b77c746d4cac37ac5289e4196070/pr-10972 (3049d58) with 3.12 (6f4f83f)}

Summary

✅ 59 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.16%. Comparing base (6f4f83f) to head (3049d58).
Report is 1 commits behind head on 3.12.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.12   #10973   +/-   ##
=======================================
  Coverage   98.16%   98.16%           
=======================================
  Files         130      130           
  Lines       39754    39754           
  Branches     2241     2241           
=======================================
  Hits        39025    39025           
  Misses        557      557           
  Partials      172      172           

Flag	Coverage Δ
CI-GHA	98.05% <ø> (ø)
OS-Linux	97.77% <ø> (ø)
OS-Windows	95.26% <ø> (-0.01%)	⬇️
OS-macOS	96.94% <ø> (-0.01%)	⬇️
Py-3.10.11	96.83% <ø> (-0.01%)	⬇️
Py-3.10.17	97.38% <ø> (+<0.01%)	⬆️
Py-3.11.12	97.47% <ø> (-0.01%)	⬇️
Py-3.11.9	96.93% <ø> (-0.01%)	⬇️
Py-3.12.10	97.83% <ø> (-0.01%)	⬇️
Py-3.13.3	97.82% <ø> (ø)
Py-3.9.13	96.72% <ø> (-0.01%)	⬇️
Py-3.9.22	97.25% <ø> (-0.02%)	⬇️
Py-pypy7.3.16	86.54% <ø> (+2.03%)	⬆️
VM-macos	96.94% <ø> (-0.01%)	⬇️
VM-ubuntu	97.77% <ø> (ø)
VM-windows	95.26% <ø> (-0.01%)	⬇️

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